CN212628374U

CN212628374U - Sound production device

Info

Publication number: CN212628374U
Application number: CN202020964966.8U
Authority: CN
Inventors: 曹成铭; 吴树文; 吴立峰; 沈凯华
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-02-26
Anticipated expiration: 2030-05-29
Also published as: WO2021237814A1

Abstract

The utility model provides a sounding device, which comprises a vibration system and a magnetic circuit system, wherein the magnetic circuit system comprises a magnetic yoke opposite to the vibration system at intervals and magnetic steel fixed on the magnetic yoke, the magnetic yoke comprises a magnetic yoke body opposite to the vibration system at intervals, a leakage part penetrating through the magnetic yoke body and an annular extension wall bent and extended from the magnetic yoke body to the direction far away from the vibration system, and the extension wall is positioned at the periphery of the magnetic steel along the vibration direction of the vibration system; the sound production device also comprises a cover plate which is covered and fixed at one end of the extension wall, which is far away from the magnet yoke body, the cover plate, the extension wall and the magnet yoke body jointly enclose a closed rear cavity, and the leakage part is communicated with the rear cavity; the magnet yoke is also provided with a leakage hole penetrating through the magnet yoke, and the leakage hole communicates the rear cavity with the outside. Compared with the prior art, the utility model discloses a sounding device simple structure, acoustic performance are excellent, user experience is effectual.

Description

Sound production device

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electroacoustic conversion field especially relates to an apply to vocal device of portable mobile electronic product.

[ background of the invention ]

The sound generating device is also called a loudspeaker, and is widely applied to portable mobile electronic products, such as mobile phones, so that an audio signal is converted into sound to be played, and the sound generating device has high loudness and vibration amplitude.

The sound production device of the related art includes the basin frame, is fixed in respectively the vibration system of basin frame and the magnetic circuit that has the magnetic gap, the magnetic circuit drive vibration system vibration sound production, vibration system is including being fixed in the vibrating diaphragm of basin frame and being fixed in vibrating diaphragm and inserting are located the magnetic gap is in order to drive the voice coil loudspeaker voice coil of vibrating diaphragm vibration sound production.

However, the sound generating device in the related art does not have a rear cavity structure or has an open rear cavity structure, and when the sound generating device is applied to portable mobile electronic products such as a mobile phone, the problem of vibration of the mobile phone shell is caused, so that the user experience effect is poor; however, the space size of the mobile phone is limited, and the sound production device cannot be designed into a loudspeaker box structure with a rear cavity in the prior art so as to overcome the problem.

Therefore, there is a need to provide a new sound generation device to solve the above technical problems.

[ Utility model ] content

An object of the utility model is to provide a sound production device that simple structure, acoustic performance are good, user experience is effectual.

In order to achieve the above object, the present invention provides a sound generating device, which includes a sound generating unit, wherein the sound generating unit includes a frame, a vibration system and a magnetic circuit system, the vibration system and the magnetic circuit system are respectively fixed on the frame and jointly enclose an inner cavity, the vibration system includes a vibrating diaphragm fixed on the frame, the magnetic circuit system includes a magnetic yoke opposite to the vibrating diaphragm at an interval, the magnetic yoke includes a magnetic yoke body opposite to the vibrating diaphragm at an interval, a leakage part penetrating through the magnetic yoke body, and a sealing wall which is bent and extended from the outer periphery of the magnetic yoke body along the frame to a direction close to the vibrating diaphragm and is annular, the sealing wall is attached to and fixed on the outer periphery of the frame and seals the inner cavity; the sounding device also comprises a rear shell which is covered and fixed on one side of the magnetic yoke body far away from the vibrating diaphragm, the rear shell and the magnetic yoke body jointly enclose a closed rear cavity, and the inner cavity is communicated with the rear cavity through the leakage part; the rear shell is also provided with a leakage hole penetrating through the rear shell, and the rear cavity is communicated with the outside through the leakage hole.

Preferably, the sound production device further comprises a damping member attached to the yoke body and completely covering the leakage portion.

Preferably, the sealing wall and the rear shell are made of metal materials.

Preferably, the sealing wall or the rear case is at least partially grounded.

Preferably, the sound production device further comprises a conductive member, one end of the conductive member is electrically connected to at least one of the sealing wall and the rear housing, and the other end of the conductive member is used for grounding.

Preferably, the conductive member is formed by extending at least one of the sealing wall and the rear case.

Preferably, the sound generating device further comprises a conductive member, wherein the conductive member comprises two electrical paths, one of the electrical paths is used for connecting the sound generating unit with an external electrical signal, and the other electrical path is used for grounding at least one of the sealing wall and the rear shell.

Preferably, the sound production device further comprises at least two positioning pieces, the two positioning pieces are connected to two opposite sides or two opposite corners of the sealing wall or the rear shell, and the positioning pieces are provided with positioning holes penetrating through the positioning pieces.

Preferably, the positioning piece is formed by extending the sealing wall or the rear shell outwards.

Preferably, the sounding monomer further comprises a front cover covering the basin frame, the front cover is close to one side of the vibrating diaphragm and surrounds the vibrating diaphragm to form a front sound cavity, the front cover is provided with a through hole penetrating through the front cover along the vibration direction of the vibration system, and the front sound cavity is connected with the outside through the through hole.

Preferably, the sound production device further comprises a ventilation damping member attached to the front cover, and the ventilation damping member completely covers the through hole.

Preferably, the part of the vibrating diaphragm fixed on the basin frame is provided with an annular sealing boss protruding towards the direction close to the front cover, and the front cover is pressed on the sealing boss to form sealing.

Preferably, the sounding device further comprises a sound guiding shell, wherein the sound guiding shell is covered on the sounding monomer and is far away from one side of the rear shell, the sound guiding shell is provided with a sound guiding cavity forming a side sounding structure, and the sound guiding cavity is communicated with the vibrating diaphragm.

Preferably, the back shell includes a back shell plate opposite to the yoke body at an interval, and a back shell extension wall bent and extended from the periphery of the back shell plate to the yoke body and fixed to the yoke body in an abutting manner; the sounding device also comprises a breathable isolating piece positioned in the rear cavity, wherein the breathable isolating piece comprises an isolating piece body arranged opposite to the rear shell plate at intervals, an isolating piece extending part bent and extending from the periphery of the isolating piece body to the direction of the rear shell plate, and an isolating piece fixing part bent and extending from one end, far away from the isolating piece body, of the isolating piece extending part; the spacer extending part and the rear shell extending wall are arranged at intervals, and the spacer fixing part is fixed on the rear shell plate; the breathable isolating piece and the rear shell plate jointly enclose a powder filling space.

Preferably, one side of the isolating piece body, which is close to the magnet yoke body, is recessed towards the direction far away from the magnet yoke body to form an avoiding step, and the avoiding step is arranged opposite to the leakage part.

Compared with the prior art, in the sounding device of the present invention, the magnetic yoke includes a magnetic yoke body opposite to the vibration system at an interval, a leakage part penetrating through the magnetic yoke body, and a sealing wall which is bent and extended from the outer periphery of the magnetic yoke body along the basin frame to a direction close to the vibration system and is annular, the sealing wall is attached to the outer periphery of the basin frame and seals the inner cavity, the inner cavity is sealed by the structure of the magnetic yoke, the structure is simple, the increase of the whole size along the direction perpendicular to the vibration direction is small, and the sounding device is more suitable for a terminal with a small installation space; simultaneously, the yoke body is kept away from the backshell is established to the side cap of vibration system, the backshell with the yoke body encloses into inclosed back chamber jointly, the portion of revealing will the inner chamber with the back chamber intercommunication, inclosed back chamber structure makes this sound production device can inhale after applying to mobile terminal moreover and shakes, has avoided the production of shell phenomenon of shaking for user experience effect is better.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is a schematic perspective view of the sound device of the present invention;

FIG. 2 is an exploded view of a part of the three-dimensional structure of the sound device of the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 1;

FIG. 4 is a sectional view taken along line B-B of FIG. 1;

FIG. 5 is a schematic view of the structure of FIG. 3 with additional conductive elements;

FIG. 6 is a schematic structural view of another derivative embodiment of FIG. 5;

FIG. 7 is a schematic structural diagram of another embodiment of adding a conductive member to the structure of FIG. 5;

FIG. 8 is a sectional view taken along line C-C of FIG. 7;

fig. 9 is a schematic structural diagram of an embodiment of adding a sound guide shell forming side sounding structure in fig. 3;

FIG. 10 is a schematic view of the embodiment of FIG. 4 with the addition of a breathable barrier;

FIG. 11 is a schematic structural view of a derivative embodiment of the embodiment shown in FIG. 10;

FIG. 12 is a schematic structural view of a diaphragm of the sound generating device shown in FIG. 1, wherein the diaphragm is provided with a sealing boss;

FIG. 13 is a schematic structural view of the sound device of FIG. 1 with an additional positioning plate;

FIG. 14 is a schematic diagram of a derivative embodiment of the embodiment shown in FIG. 13.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a sound generating device 100, which includes a sound generating unit 10, wherein the sound generating unit 10 includes a basin frame 1, a vibration system 2, a magnetic circuit system 3 and a back shell 4.

The vibration system 2 and the magnetic circuit system 3 are respectively fixed on two opposite sides of the basin frame 1 and jointly enclose an inner cavity 101, the vibration system 2 comprises a vibrating diaphragm 21 fixed on the basin frame 1, and the magnetic circuit system 3 drives the vibration system 2 to vibrate and sound.

The magnetic circuit system 3 includes a magnetic yoke 31 spaced from and facing the diaphragm 21 and a magnetic steel 32 fixed to the magnetic yoke 31. Yoke 31 include with 2 relative yoke bodies 311 of interval of vibrating diaphragm, run through the portion of leaking 312 of yoke body 311 and by the outside edge of yoke body 311 is followed basin frame 1 is to being close to vibration system 2's direction bending extension is annular seal wall 313, the seal wall 313 laminating is fixed in the periphery side of basin frame 1 and will inner chamber 101 is sealed to the inner chamber 101 that makes the sound production monomer 10 form sealedly through the self structural design of yoke 31, omits extra structure for sealing, has reduced the assembly process. Wherein, the magnetic yoke body 311 and the diaphragm 21 are respectively fixed on two opposite sides of the basin stand 1.

In the present embodiment, the outer peripheral edge means: when the yoke body 311 is disposed in a ring shape, the yoke body 311 has an outer circumferential edge and an inner circumferential edge, and the sealing wall 313 extends from the outer circumferential edge of the yoke body 311; when the yoke body 311 has a flat plate shape, the sealing wall 313 extends from the periphery of the yoke body 311.

The back shell 4 is covered and fixed on one side of the magnetic yoke body 311 far away from the vibration system 2. The rear case 4 and the yoke body 311 together enclose a sealed rear cavity 102, and the leakage portion 312 communicates the inner cavity 101 with the rear cavity 102. The acoustic performance, especially the low-frequency acoustic performance, of the sound generating device 100 is effectively improved due to the formation of the rear cavity 102, and the rear cavity 102 is used for absorbing vibration, so that the shell vibration phenomenon of electronic products such as mobile terminals cannot be caused after the sound generating device 100 is applied to the electronic products such as the mobile terminals, and the user experience effect of customers is effectively improved. In this embodiment, the rear case 4 is provided with a leakage hole 41 penetrating therethrough, and the leakage hole 41 communicates the rear cavity 102 with the outside for balancing the sound pressure in the rear cavity 102.

In this embodiment, the sound generating device 100 further includes a damping member 5 attached to the yoke body 311 and completely covering the leakage portion 312, for adjusting the damping of the leakage portion 312 and improving the acoustic performance.

It is possible that the rear shell 4 and the sealing wall 313 are made of metal or ceramic or glass material. In this embodiment, the rear case 4 and the sealing wall 313 are preferably made of a metal material. This arrangement may be made thinner with the same structural strength, so that the dimension of the sound-generating device 100 in the direction perpendicular to the vibration direction of the diaphragm 21 may be minimized. Moreover, the back shell 4 is covered on the magnetic yoke body 311, so that the size of the back cavity 102 along the direction perpendicular to the vibration direction of the vibration system 2 does not exceed the size of the sound generating device 100, and the mobile terminal is more suitable for a mobile terminal with a smaller lateral space.

Through designing into above-mentioned structure yoke 31, can realize the utility model discloses the technical problem that needs the solution effectively reduces component quantity and simplifies the structure, improves assembly efficiency.

The sounding single body 10 further comprises a front cover 7 which is covered on one side of the basin frame 1 close to the vibrating diaphragm 21 and forms a front sound cavity 103 with the vibrating diaphragm 21, the front cover 7 is provided with a through hole 71 which penetrates through the vibrating diaphragm 21 along the vibration direction, and the front sound cavity 103 is connected with the outside through the through hole 71. The provision of the front cover 7 effectively improves medium and high frequency acoustic performance.

In order to further improve the medium-frequency and high-frequency performance of the sound-generating device 100, the sound-generating device 100 further comprises a ventilation damping member 8 attached to the front cover 7, wherein the ventilation damping member 8 completely covers the through hole 71, and is used for preventing foreign matters from entering the front sound cavity 103 on one hand, and adjusting the medium-frequency and high-frequency performance of the sound-generating device 100 by adjusting the damping of the ventilation damping member 8 on the other hand.

In this embodiment, the through holes 71 include a plurality of through holes and are arranged in an array, so as to improve the sound stability and balance.

Because the part (i.e. the gluing surface) of the diaphragm 21 fixed on the frame 1 has a small area and a narrow width, the reliability of the sealing is poor. Therefore, in the present embodiment, please refer to fig. 12, in the sound generator 100, the annular sealing boss 211 protruding toward the front cover 7 is disposed on the portion of the diaphragm 21 fixed to the frame 1, and when assembling, the front cover 7 is pressed on the sealing boss 211 and forms a seal by compressing the sealing boss 211, so that the sealing reliability is better.

With continued reference to fig. 1-4, in the present embodiment, the sealing wall 313 or the rear housing 4 is at least partially grounded. The structure is combined with the basis that the sealing wall 313 and the rear shell 4 are made of metal materials, so that the shielding effect of the rear cavity is realized, and the stability is improved. The provision of a metal material for the sealing wall 313 or the rear housing 4 allows for a thinner design while still providing structural strength, thereby further reducing the lateral dimension of the sound device 100 in a direction perpendicular to the direction of vibration.

Fig. 5 is a schematic view of the conductive member added in fig. 3. Specifically, in the sound production device 400, the sealing wall 4313 and the back shell 404 are made of metal materials. The sounding device 400 further includes a conductive member 6, one end of the conductive member 6 is connected to at least one of the sealing wall 4313 and the rear housing 404, and the other end of the conductive member 6 is grounded, so as to form a shielding effect, so that the sounding device 400 is prevented from being interfered by external electromagnetic waves, and the working reliability is better.

Please refer to fig. 6, which is a schematic perspective view of another derivative embodiment of fig. 5. That is, in the sound producing device 500, the conductive member 56 is integrally formed with the sealing wall 5313 or the rear housing 54. That is, the conductive member 56 is formed by extending the sealing wall 5313, or the conductive member 56 is formed by extending the rear case 54. For example, the conductive member 56 and the rear housing 54 are integrally formed. The integral structure design reduces the number of parts and improves the assembly efficiency.

Fig. 7 is a schematic structural diagram of another embodiment of adding a conductive member in fig. 5. This embodiment differs from the embodiment shown in fig. 3 in that the structure and function of the conductive member are different.

The sounding device 600 further includes a conductive member 66, where the conductive member 66 includes two mutually insulated electrical paths, and one of the electrical paths is used for connecting the sounding unit 610 with an external electrical signal and supplying power to the sounding unit 610; the other electrical path is used to ground at least one of the sealing wall 6313 and the rear casing 64, so as to form a shield for the sound generating unit 610. In this embodiment, the conductive member 66 is used to form a shielding function together with the rear case 64 and the sealing wall 6313, and is also used to supply power to the sound generating unit 610, so that the structure is simpler and dual functions can be realized.

For example, the conductive member 66 is an FPC structure, as shown in fig. 7-8, the conductive member 66 includes a first arm 661 connected to the yoke 631, a second arm 662 extending from opposite ends of the first arm 661 toward the frame 61, a third arm 663 extending from the first arm 661 toward a direction away from the sealing wall 6313, a fourth arm 664 extending from the first arm 661 toward the back case 64 in the vibration direction of the diaphragm 621 by bending, and a fifth arm 665 extending from the end of the fourth arm 664 toward the vibration direction perpendicular to the diaphragm 621 by bending and fixed to the back case 64.

The first arm 661 is electrically connected to the yoke 631 or the rear case 64, the second arm 662 is electrically connected to the sounding unit 610, the third arm 663 is used to connect an external electric signal, and the fifth arm 665 is used to ground. Specifically, the second arm 662 is fixed to the frame 61 and electrically connected to the vibration system 62, the third arm 663 is used for connecting an external electrical signal, and the fifth arm 665 is used for grounding. Therefore, the effect of providing an electric signal for the vibration system and the shielding effect can be realized. That is, the first arm 661, the fourth arm 664 and the fifth arm 665 jointly realize the connection between the rear case 64 or the sealing wall 6313 and the ground, so as to form an electrical path for shielding the sound generating unit 610; the first arm 661, the second arm 662 and the third arm 663 jointly realize that the sounding unit 610 is electrically connected with an external electric signal, and realize as another electric passage for communicating the sounding unit 610 with the external electric signal.

Fig. 9 is a schematic structural diagram of an embodiment of the sound emitting structure with the sound guiding shell added to form a side sound emitting structure in fig. 3. The main difference lies in that the sounding device is used for sounding from the front side to form a side sounding structure.

The sound generating device 800 further comprises a sound guiding shell 9 covering one end of the sound generating unit 810 far away from the rear shell 84, wherein the sound guiding shell 9 is provided with a sound guiding cavity 90 forming a side sound generating structure 91, and the sound guiding cavity is communicated with the vibrating diaphragm 821 90. This side vocal structure 91 can be better guide the sound production, is convenient for positive sound production and is used under the condition that keeps off, and the flexibility of use is higher.

Specifically, the sound guiding shell 9 includes a sound guiding shell plate 901 spaced apart from one side of the vibrating diaphragm 821 far from the magnetic circuit system 83, and a sound guiding shell extension wall 902 extending from the periphery of the sound guiding shell plate 901 to the direction of the vibrating diaphragm 821 in a bending manner, the sound guiding shell 9 and the vibrating diaphragm 821 together enclose the sound guiding cavity 90, the side sound generating structure 91 is disposed through the sound guiding shell extension wall 902, and the side sound generating structure 91 communicates the sound guiding cavity 90 with the outside to form side sound generation, so as to facilitate flexible application of different installation positions.

It should be noted that the sound guiding cavity 90 may be directly communicated with the diaphragm 821 (i.e., without the front cover 807 structure), or the diaphragm 812 may be first communicated with the front sound cavity 8103 and then communicated with the sound guiding cavity 90 through the through hole 871, so as to achieve indirect communication.

Please refer to fig. 10, which is a schematic view of the embodiment of fig. 4 with the ventilation isolation member added. In the sound generating device 900, the rear housing 94 includes a rear housing plate 941 spaced apart from and facing the yoke body 9311, and a rear housing extension wall 942 bent and extended from the periphery of the rear housing plate 941 toward the yoke body 9311 and fixed to the yoke body 9311 in an abutting manner; the sounder device 900 is further including being located ventilative spacer 99 in the rear cavity 9102, ventilative spacer 99 include with the relative spacer body 991 that sets up in back shell plate 941 interval, by spacer body 991's periphery to the spacer extension 992 that the back shell plate 941 direction was buckled and is extended and by spacer extension 992 is kept away from spacer body 991's one end to the spacer fixed part 993 that the back shell extension 942 direction was buckled and is extended.

The spacer extension 992 is spaced apart from the rear case extension wall 942, and the spacer fixing portion 993 is fixed to the rear case plate 941. The breathable isolation piece 99 and the rear shell 94 together form a powder filling space 990, and the powder filling space 990 is used for filling sound absorption particles to form a D-BASS virtual sound cavity, so that the acoustic performance is further improved. The structure that the spacer extension 992 and the rear shell extension wall 942 are arranged at intervals enables air flow in the rear cavity 9102 to be smoother, and acoustic performance is better.

Please refer to fig. 11, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in fig. 10. In the sounding device 1000, one side of the spacer body 1991 close to the yoke body 1311 is recessed to a direction far away from the yoke body 1311 to form an avoiding step 1994, and the avoiding step 1994 is arranged opposite to the leakage part 1312. This arrangement allows for smoother leakage of the interior 1101 of the sound producing device 1000, thereby improving sound production performance.

Fig. 13 is a schematic structural view of an embodiment of adding a positioning plate to the sound generating device shown in fig. 1. The sound device 1100 further includes at least two locating tabs 88 and is connected to the sealing wall 11313 or the back housing 114, respectively. The end of the positioning plate 88 away from the sealing wall 11313 or the rear housing 114 is provided with a positioning hole 881 penetrating therethrough for fixing and positioning the sound generating device 1100 with the terminal, such as a threaded hole, and the sound generating device can be fixed on the terminal by the positioning hole 881 using a screw, which is simple and convenient, and the positioning plate 88 is provided with at least two positioning holes to more effectively form positioning and fixing. In order to further improve the fixing stability, the two positioning pieces 88 are connected to two opposite sides or two pairs of corners of the sealing wall 11313 or the rear housing 114, and the positioning and fixing effects of the sound generating device 1100 and the terminal overall machine are better due to the symmetrical arrangement. In the present embodiment, the positioning plate 88 is fixed by welding, for example, the rear housing 114 is fixed by welding, that is, the positioning plate 88 and the rear housing 114 are a split structure of two components. Of course, the locating tabs 88 may also be used to simultaneously ground and form a shield for the rear housing 114 when the rear housing 114 is made of a metallic material. In this embodiment, the positioning tabs 88 are connected to two opposite corners of the sealing wall 11313 or the rear case 114.

Please refer to fig. 14, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in fig. 13. The difference between the sound device 1200 of fig. 13 and the sealing wall 12313 or the rear housing 124 of the sound device 1200 of the present embodiment is that the positioning plate 1288 is formed by extending the sealing wall 12313 or the rear housing 124, i.e. the positioning plate 1288 and the sealing wall 12313 or the rear housing 124 are integrally formed, for example, the positioning plate 1288 and the rear housing 124 are integrally formed. The molding is simple, reduces the device quantity, improves assembly efficiency. The positioning tabs 88 in this embodiment are attached to opposite sides of the sealing wall 12313 or the rear housing 114.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims

1. A sounding device comprises a sounding monomer, wherein the sounding monomer comprises a basin frame, a vibration system and a magnetic circuit system, the vibration system and the magnetic circuit system are respectively fixed on the basin frame and jointly enclose an inner cavity, the vibration system comprises a vibrating diaphragm fixed on the basin frame, the magnetic circuit system comprises a magnetic yoke opposite to the vibrating diaphragm at an interval, and the sounding device is characterized in that the magnetic yoke comprises a magnetic yoke body opposite to the vibrating diaphragm at an interval, a leakage part penetrating through the magnetic yoke body and an annular sealing wall, the annular sealing wall is bent and extended from the outer periphery of the magnetic yoke body along the basin frame to the direction close to the vibrating diaphragm, and the sealing wall is attached to the outer periphery of the basin frame and seals the inner cavity; the sounding device also comprises a rear shell which is covered and fixed on one side of the magnetic yoke body far away from the vibrating diaphragm, the rear shell and the magnetic yoke body jointly enclose a closed rear cavity, and the inner cavity is communicated with the rear cavity through the leakage part; the rear shell is also provided with a leakage hole penetrating through the rear shell, and the rear cavity is communicated with the outside through the leakage hole.

2. The sounder device according to claim 1, further comprising a damping member affixed to the yoke body and completely covering the leakage.

3. The sounder device according to claim 1, wherein the sealing wall and the rear housing are both made of a metallic material.

4. The sounder device according to claim 3, wherein the sealing wall or the rear housing is at least partially grounded.

5. The sounder device according to claim 3, further comprising a conductive member having one end electrically connected to at least one of the sealing wall and the rear housing and another end for grounding.

6. The sounder device according to claim 5, wherein the conductive member is formed by an extension of at least one of the sealing wall and the rear housing.

7. The sounder device according to claim 3, further comprising a conductive member comprising two electrical paths, one of the electrical paths for connecting the sounding body to an external electrical signal, and the other electrical path for grounding at least one of the sealing wall and the rear housing.

8. The sounder device according to claim 3, further comprising at least two positioning tabs connected to opposite sides or two pairs of corners of the sealing wall or the rear housing, the positioning tabs having positioning holes therethrough.

9. The sounder device according to claim 8, wherein the locating tab is formed by an outward extension of the sealing wall or the rear housing.

10. The sounding device according to claim 1, wherein the sounding unit further comprises a front cover covering one side of the frame close to the diaphragm and enclosing with the diaphragm to form a front sound cavity, the front cover is provided with a through hole penetrating through the front cover along the vibration direction of the vibration system, and the through hole connects the front sound cavity with the outside.

11. The sounder device according to claim 10, further comprising a gas permeable damping member affixed to the front cover, the gas permeable damping member completely covering the through hole.

12. The sounding device according to claim 10, wherein the portion of the diaphragm fixed to the frame is provided with an annular sealing boss protruding in a direction close to the front cover, and the front cover is pressed against the sealing boss to form a seal.

13. The device of claim 1, further comprising a sound guide housing covering a side of the sound generating unit away from the back housing, the sound guide housing having a sound guide cavity forming a side sound generating structure, the sound guide cavity communicating with the diaphragm.

14. The sounder device according to claim 1, wherein the back housing includes a back housing plate spaced from and opposing the yoke body, and a back housing extension wall extending from a periphery of the back housing plate in a direction toward the yoke body and abutting and fixed to the yoke body; the sounding device also comprises a breathable isolating piece positioned in the rear cavity, wherein the breathable isolating piece comprises an isolating piece body arranged opposite to the rear shell plate at intervals, an isolating piece extending part bent and extending from the periphery of the isolating piece body to the direction of the rear shell plate, and an isolating piece fixing part bent and extending from one end, far away from the isolating piece body, of the isolating piece extending part; the spacer extending part and the rear shell extending wall are arranged at intervals, and the spacer fixing part is fixed on the rear shell plate; the breathable isolating piece and the rear shell plate jointly enclose a powder filling space.

15. The sounder device according to claim 14, wherein a side of the spacer body adjacent to the yoke body is recessed away from the yoke body to form an escape step, and the escape step is disposed opposite to the leakage portion.